Water-heating apparatus.



N0. 673,96l. Patented May l4, I90l. J. T. MAZEY. WATER HEATlNGAPPARATUS.

(Application Med Mar. 31, 1900.)

(No Model.)

Inueni'or,

Hz'incsses,

m: worms PETERS co, wore-urns" WASNNGTON, u. c

UNTTED STATES ATE T EETcE.

JOHN THOMAS MAZEY, OF COVENTRY, ENGLAND.

WATER-HEATIN G APPARATUS.

' SPECIFICATION forming part of Letters Patent No. 673,961, dated May14, 1901.

Application filed March 31, 1900.

T aZZ whom it may concern:

Be it known that I, JOHN THOMAS MAZEY, a subject of the Queen of GreatBritain, residing at Coventry, county of Warwick, England, have inventedcertain new and useful Improvements in Water-Heating Apparatus, of whichthe following is a specification.

My invention relates to water-heating apparatus, and has for its objectto provide an improved slow-combustion boiler.

In the accompanying drawings, Figures I and II are side and frontelevations, respectively, of a boiler constructed according to myinvention. Fig. III is a vertical transverse section of the same on theline I I in Fig. I. Fig. IV is a plan on the line II II in Figs. I andII. Figs. V and VI are an inverted plan and front elevation,respectively, showing a modified arrangement of fire-bars.

The same numerals refer to like parts throughout the drawings.

In constructing a boiler according to my invention I take two cast-ironoval taper shells 2 3 of equal length, but unequal diameters. Thesmaller shell 3 is arranged within the larger 2, and the two are held inposition by top and bottom plates 4 5, the whole being held together bylongitudinal bolts. It is convenient tomake the two shells of suchrelative dimensions that the large end of the inner shell may be passedthrough the small end of the outer shell in fitting up the boiler. Theupper plate 4 is formed with two oval grooves 7 9 on its under side, thelarger groove 7 being adapted to receive the top of the larger shell 2and the smaller groove 9 being adapted to receive the top of the smallershell 3. The center of the plate 4 is carried upward in the shape of ahollow cylinder to form a hopper 11, which is covered by a removable lid12. The smoke-pipe 13 preferably leads out from the hopper 11, but mayproject directly from the top plate, as shown in dotted lines in Fig. I.The base or lower plate has two oval grooves 8 on its upper surfacecorresponding to those on the lower surface of the upper plate 4, andthe lower edges of the shells 2 3 are adapted to enter the said grooves8 10, respectively, as shown. Washers 6, of asbestos or other suitablepacking material, are preferably laid in Serial No. 11,013. (No model.)

the beds of all the grooves. The center portion of the base is fittedwith fire-bars 14, preferably at a short distance above the ground. Anash-tray 15 may be fitted under the fire-bars. A sliding door 16 may belit ted on the lower part of the outer shell 2 or, preferably, on theskirting 23 of the bottom plate 5, as shown, or other suitable means maybe provided for giving access to the firebars and ash-tray, if any. Asuitable number of tie-bolts 17-saysix-connect the top plate 4 with thebase 5, passing through the space between the shells, and are tightenedby nuts 18 at one or both ends thereof. Tightening the nuts secures theshells 2 3 firmly within the grooves 7 8 9 l0 and grips the saidshells,top plate 4,and base 5 together. Red lead or the like 24 isemployed in addition to the above-mentioned packing, or other suitablemeans may be adopted to secure water-tight joints between the plates andshells and bolts. Water 21 is admitted to the annular space between theshells through an orifice 19 in the outer shell at or near the bottomthereof. The water is heated by the combustion of coke or other suitablematerial or materials 22 within the inner shell, and the water whenheated issues from the annular space through an orifice at or near thetop of the outer shell below the smoke-pipe.

I sometimes divide the fire-bars 14 along the major axis and adapt theouter edges thereof to hook (25) onto the bottom plate 5. The fire-barsare normally supported on a rod 26, passing across the base under thesaid firebars, so that by withdrawing the rod the halves of thefire-bars are able to turn downward and release any clinker or the likewhich may have accumulated in the bottom of the stove, or, as shown inFigs. V and VI, the said fire-bars may remain in one piece,hinged (28)by their rear end to the bottom plate and normally held up bybar-buttons 31. When the outer ends of the buttons are drawn together,the front end of the fire-bars falls, Fig. VI, and allows of the readyremoval of the clinker, as before. In either case the firebars are setat a suitable height to allow of their falling, and the boiler proper ispreferably raised by the skirting 23 or otherwise for this purpose.

The above-mentioned boilers are specially suitable for heatinggreenhouses and for similar purposes.

What I desire to secure by Letters Patent isl 1. In water-heatingapparatus the combination of, an oval taper outer shell, an oval taperinner shell, a top plate, a bottom plate, tie-bolts passing from the topplate to the bottom plate between the inner and outer shells, and ahopper formed with the top plate, substantially as set forth.

2. In water-heating apparatus, the combination of, an oval taper outershell, an oval taper inner shell, a top plate, a bottom plate, tie-boltspassing from the top plate to the bottom plate between the inner andouter shells, and a hopper and a smoke-pipe formed with the top plate,substantially as set forth.

JOHN THOMAS MAZEY.

Witnesses:

JOHN THOMAS FAZAKARLEY, THOS. F. WILSON.

